document.write( "Question 1110674: Car A and car B enter an expressway at the same time and place and head the same direction. Car A travels at 76 miles per hour. After 3 hours, car B is 42 miles behind car A. What is the speed of var B?\r
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Algebra.Com's Answer #725679 by ikleyn(52781) $\"\"$ $\"About$

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\n" ); document.write( "1) Car A and car B enter an expressway at the same time and place and head the same direction. Car A travels at 76 miles per hour.
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document.write( "In 3 hours, car A traveled the distance of  3*76 = 228 miles.\r\n" );
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document.write( "At this time, car B was 42 miles behind car B. Hence, it traveled 228 - 42 = 186 miles in 3 hours.\r\n" );
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document.write( "Then the average speed of the car B  is   = 62 mph.\r\n" );
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\n" ); document.write( "2) After dieting and excersing for several months, Sam now weighs 20% less than he did originally.
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document.write( "Let x be the Sam's original weight (which is under the question).\r\n" );
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document.write( "Then the problem says that  (1-0.2)*x = 180 pounds,   or   0.8x = 180,\r\n" );
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document.write( "which implies  x =  = 225 pounds.\r\n" );
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document.write( "It is your answer.\r\n" );
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